source3/lib/conn_tdb.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    Low-level connections.tdb access functions
   4    Copyright (C) Volker Lendecke 2007
   5
   6    This program is free software; you can redistribute it and/or modify
   7    it under the terms of the GNU General Public License as published by
   8    the Free Software Foundation; either version 3 of the License, or
   9    (at your option) any later version.
  10
  11    This program is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14    GNU General Public License for more details.
  15
  16    You should have received a copy of the GNU General Public License
  17    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  18 */
  19
  20 #include "includes.h"
  21 #include "system/filesys.h"
  22 #include "smbd/globals.h"
  23 #include "dbwrap/dbwrap.h"
  24 #include "dbwrap/dbwrap_open.h"
  25 #include "dbwrap/dbwrap_rbt.h"
  26 #include "messages.h"
  27 #include "lib/conn_tdb.h"
  28 #include "util_tdb.h"
  29
  30 static struct db_context *connections_db_ctx(bool rw)
  31 {
  32         static struct db_context *db_ctx;
  33         int open_flags;
  34
  35         if (db_ctx != NULL) {
  36                 return db_ctx;
  37         }
  38
  39         open_flags = rw ? (O_RDWR|O_CREAT) : O_RDONLY;
  40
  41         db_ctx = db_open(NULL, lock_path("connections.tdb"), 0,
  42                          TDB_CLEAR_IF_FIRST|TDB_INCOMPATIBLE_HASH|TDB_DEFAULT,
  43                          open_flags, 0644, DBWRAP_LOCK_ORDER_1);
  44         return db_ctx;
  45 }
  46
  47 static struct db_record *connections_fetch_record(TALLOC_CTX *mem_ctx,
  48                                                   TDB_DATA key)
  49 {
  50         struct db_context *ctx = connections_db_ctx(True);
  51
  52         if (ctx == NULL) {
  53                 return NULL;
  54         }
  55
  56         return dbwrap_fetch_locked(ctx, mem_ctx, key);
  57 }
  58
  59 struct db_record *connections_fetch_entry_ext(TALLOC_CTX *mem_ctx,
  60                                               struct server_id id,
  61                                               int cnum,
  62                                               const char *name)
  63 {
  64         struct connections_key ckey;
  65         TDB_DATA key;
  66
  67         ZERO_STRUCT(ckey);
  68         ckey.pid = id;
  69         ckey.cnum = cnum;
  70         strlcpy(ckey.name, name, sizeof(ckey.name));
  71
  72         key.dsize = sizeof(ckey);
  73         key.dptr = (uint8 *)&ckey;
  74
  75         return connections_fetch_record(mem_ctx, key);
  76 }
  77
  78 struct db_record *connections_fetch_entry(TALLOC_CTX *mem_ctx,
  79                                           connection_struct *conn,
  80                                           const char *name)
  81 {
  82         struct server_id id = messaging_server_id(conn->sconn->msg_ctx);
  83         return connections_fetch_entry_ext(mem_ctx, id, conn->cnum, name);
  84 }
  85
  86 struct connections_forall_state {
  87         struct db_context *session_by_pid;
  88         int (*fn)(const struct connections_key *key,
  89                   const struct connections_data *data,
  90                   void *private_data);
  91         void *private_data;
  92         int count;
  93 };
  94
  95 struct connections_forall_session {
  96         uid_t uid;
  97         gid_t gid;
  98         char machine[FSTRING_LEN];
  99         char addr[FSTRING_LEN];
 100 };
 101
 102 static int collect_sessions_fn(struct smbXsrv_session_global0 *global,
 103                                void *connections_forall_state)
 104 {
 105         NTSTATUS status;
 106         struct connections_forall_state *state =
 107                 (struct connections_forall_state*)connections_forall_state;
 108
 109         uint32_t id = global->session_global_id;
 110         struct connections_forall_session sess;
 111
 112         sess.uid = global->auth_session_info->unix_token->uid;
 113         sess.gid = global->auth_session_info->unix_token->gid;
 114         strncpy(sess.machine, global->channels[0].remote_name, sizeof(sess.machine));
 115         strncpy(sess.addr, global->channels[0].remote_address, sizeof(sess.addr));
 116
 117         status = dbwrap_store(state->session_by_pid,
 118                               make_tdb_data((void*)&id, sizeof(id)),
 119                               make_tdb_data((void*)&sess, sizeof(sess)),
 120                               TDB_INSERT);
 121         if (!NT_STATUS_IS_OK(status)) {
 122                 DEBUG(0, ("Failed to store record: %s\n", nt_errstr(status)));
 123         }
 124         return 0;
 125 }
 126
 127 static int traverse_tcon_fn(struct smbXsrv_tcon_global0 *global,
 128                             void *connections_forall_state)
 129 {
 130         NTSTATUS status;
 131         struct connections_forall_state *state =
 132                 (struct connections_forall_state*)connections_forall_state;
 133
 134         struct connections_key key;
 135         struct connections_data data;
 136
 137         uint32_t sess_id = global->session_global_id;
 138         struct connections_forall_session sess = {
 139                 .uid = -1,
 140                 .gid = -1,
 141         };
 142
 143         TDB_DATA val = tdb_null;
 144
 145         status = dbwrap_fetch(state->session_by_pid, state,
 146                               make_tdb_data((void*)&sess_id, sizeof(sess_id)),
 147                               &val);
 148         if (NT_STATUS_IS_OK(status)) {
 149                 memcpy((uint8_t *)&sess, val.dptr, val.dsize);
 150         }
 151
 152         ZERO_STRUCT(key);
 153         ZERO_STRUCT(data);
 154
 155         key.pid = data.pid = global->server_id;
 156         key.cnum = data.cnum = global->tcon_global_id;
 157         strncpy(key.name, global->share_name, sizeof(key.name));
 158         strncpy(data.servicename, global->share_name, sizeof(data.servicename));
 159         data.uid = sess.uid;
 160         data.gid = sess.gid;
 161         strncpy(data.addr, sess.addr, sizeof(data.addr));
 162         strncpy(data.machine, sess.machine, sizeof(data.machine));
 163         data.start = nt_time_to_unix(global->creation_time);
 164
 165         state->count++;
 166
 167         return state->fn(&key, &data, state->private_data);
 168 }
 169
 170 int connections_forall_read(int (*fn)(const struct connections_key *key,
 171                                       const struct connections_data *data,
 172                                       void *private_data),
 173                             void *private_data)
 174 {
 175         TALLOC_CTX *frame = talloc_stackframe();
 176         struct connections_forall_state *state =
 177                 talloc_zero(talloc_tos(), struct connections_forall_state);
 178         NTSTATUS status;
 179         int ret = -1;
 180
 181         state->session_by_pid = db_open_rbt(state);
 182         state->fn = fn;
 183         state->private_data = private_data;
 184         status = smbXsrv_session_global_traverse(collect_sessions_fn, state);
 185         if (!NT_STATUS_IS_OK(status)) {
 186                 DEBUG(0, ("Failed to traverse sessions: %s\n",
 187                           nt_errstr(status)));
 188                 goto done;
 189         }
 190
 191         status = smbXsrv_tcon_global_traverse(traverse_tcon_fn, state);
 192         if (!NT_STATUS_IS_OK(status)) {
 193                 DEBUG(0, ("Failed to traverse tree connects: %s\n",
 194                           nt_errstr(status)));
 195                 goto done;
 196         }
 197         ret = state->count;
 198 done:
 199         talloc_free(frame);
 200         return ret;
 201 }
 202
 203 bool connections_init(bool rw)
 204 {
 205         return (connections_db_ctx(rw) != NULL);
 206 }